* Skin::newFromKey() was removed (deprecated since 1.24).
* Skin::getUsableSkins() was removed (deprecated since 1.23).
* LoadBalancer::pickRandom() was removed (deprecated in 1.21).
+* Article::getUndoText() and WikiPage::getUndoText were removed (deprecated since
+ 1.21).
+* DifferenceEngine::setText() was removed (deprecated in 1.21).
+* Title::newFromRedirectArray() was removed (deprecated in 1.21).
== Compatibility ==